First Deploy Attribution

A medium SQL mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.

Domain
SQL
Difficulty
medium
Seniority
L4

Interview Prompt

A release engineer tracks onboarding velocity for each service in `deploy_logs`. For every service, return its `total_deploys` and its `first_time_deploys`, the deployments that were some author's first-ever deployment to that service.

Summary

The first deploy per service.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write and run your SQL against a real database
  4. Answer the interviewer's follow-up questions, then get a hire or no-hire decision